Is this only me, or have others experienced a noticeable performance drop in their Steam games somewhere in the last 2 weeks? I was getting a dependable 55-75 FPS in Helldivers 2. I was getting 60+ in Ready or Not. As of late, both games use a lot more CPU than they used to, and my FPS is lower. I only get ~50 FPS in Helldivers 2 and never more. There are small stutters that had not existed before. RoN is similar. I will only get around ~45 FPS, and I even set the graphics lower than I had before with nearly no advantage.

Since I recently converted my system partition to GPT with UEFI boot loader and flashed BIOS to latest version, then enabled 4G Decoding and enabled SMT in BIOS, I thought those things were suspect, naturally. However, I diligently retested these games by changing one setting at a time back to my older settings. The only thing I haven't tested is reverting to older BIOS version.

Am I alone here? I'm trying to whittle down the potential suspects here, like Proton for example.